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Steel and Composite Structures Volume 58, Number 3, February 10 2026 , pages 301-321 DOI: https://doi.org/10.12989/scs.2026.58.3.301 |
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Residual bonding properties of CFRP cable-UHPC interface after thermo-mechanical coupling |
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Zhengwen Jiang, Xilong Zhao, Hao Chen, Zhi Fang, Quanhao Li, Zhiwei Wang
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| Abstract | ||
| To further investigate mechanical properties of the UHPC-filled anchorage system for CFRP cables after fire, pullout tests were conducted on the CFRP cable-UHPC interface after cooling from elevated temperature exposure, considering initial pullout load ratio R. Effects of treatment temperature Tt, R and effective bond length Le on the residual bond-slip behavior of bonding interface after thermo-mechanical coupling were identified. The recovery laws of residual bonding properties of the bonding interface after thermo-mechanical coupling were also quantified. Finally, practical formulas were proposed to determine the residual average bond strength τu-A and recovery proportions of τu-A and the effective shear stiffness KA for the bonding interface after thermo-mechanical coupling. Results demonstrated that slip failure was the primary failure mode at bonding interfaces in all pullout specimens after thermo-mechanical coupling. τu-A and KA decreased by 31.95~32.57% and 21.68~28.78% as Tt increased from 25°C (ambient temperature) to 210°C (the glass transition temperature of resin matrix), respectively. Compared with specimens without initial pullout load after cooling from elevated temperature exposure, those with R ranging from 0.2 to 0.6 and Le of (5~15)d after exposure to 100°C showed further reductions of 4.35~15.43% in τu-A and 9.78~31.13% in KA. The recovery proportions of τu-A and KA increased with increasing Tt in the range of 25~210°C, and decreased with R varying from 0 to 0.6. Practical formulas proposed in this study can predict τu-A and the recovery laws of bonding properties with good accuracy. | ||
| Key Words | ||
| CFRP cable-UHPC interface; pullout test after thermo-mechanical coupling; recovery law; residual bonding performance | ||
| Address | ||
| Zhengwen Jiang: 1)Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China 2) Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China Xilong Zhao:Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China Hao Chen:Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China Zhi Fang:Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China Quanhao Li:Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China Zhiwei Wang:Zhongfu Carbon Fiber Core Cable Technology Co. Ltd., Jiangsu, Lianyungang, 222069, China | ||